If you’re planning on traveling to or near Chicago Sunday, be sure to bring an umbrella.
Some scattered showers could continue through the morning with a chance for an isolated storm, though a higher chance for rain comes in the evening in areas south and west of the city.
Highs are expected to be a bit cooler to wrap up the weekend, rising into the upper 70s.
By Monday, the sunshine is expected to return, but temperatures are will likely climb rapidly into the mid-to-upper 80s. Humid conditions are also possible for much of the area amid sunny skies.
Tuesday and Wednesday could be warmer, with highs climbing into the low 90s.
Soruce : https://www.nbcchicago.com/weather/slight-cooldown-with-chance-for-showers-storms-sunday/2883698/